Harry Redknapp is weighing up whether to make changes to his unbeaten Portsmouth team tonight as they face what he knows is their toughest Premiership task of the season so far.

Bolton, and their manager Sam Allardyce, arrive at Fratton Park to face a
Portsmouth team who have dropped just two points in the opening five games and
have yet to concede a goal.

Portsmouth boss Redknapp, who like Allardyce was featured on the BBC Panorama
which looked at alleged illegal practices in English football, insists he is
only concerned about tonight's game. Both men denied the allegations made
against them by Panorama.

'It's always a tough one against Bolton,' said Redknapp. 'They have good
players and use a system of play that makes it very difficult for opponents.

'They play two wide, one through the middle up front, and Ivan Campo sits in
the space in the middle of the park controlling the game.

'It is five in midfield, really, and you can get outnumbered in there. It's
just like Arsenal did to Manchester United last week at Old Trafford.

'It is very difficult unless you change your own system to match theirs and
if you do, it leaves you only one up front and people moan that is negative at
home.'

Portsmouth have used a basic 4-4-2 system so far, but Redknapp could pull
striker Kanu deeper into midfield or call up £2.5million new signing Niko
Kranjcar for his Premiership debut.

Midfielder Sean Davis said: 'We have enjoyed the way we are playing but we
can't risk being outgunned in midfield by Bolton.

'They are a very well organised side and Kevin Nolan typifies them. I find it
strange he still hasn't been picked for England and we'll need to watch him.'

Kanu believes Bolton's £8million French striker Nicolas Anelka - his former
Arsenal team-mate and the player Redknapp tried to sign from Turkish side
Fenerbahce in the summer - will be the main danger to Portsmouth.

The Nigerian, who has already scored four times this season, said: 'Anelka
has a lot of pace and can do everything a striker needs to do. He can shoot and
hit the ball and he's very determined.'

But Redknapp, whose team will go back to the top of the table above champions
Chelsea with another win tonight, still has not ruled out a slight adjustment to
his line-up.

If Portsmouth keep another clean sheet they will equal Chelsea's record of not
conceding a goal in the first six matches from two years ago.

The manager said: 'We've got a competitive squad now and the ones who have
just come in are getting desperate to make the team. It's going to be very
interesting.

'It has surprised a lot of people to see us up there at this stage of the
season and I would be a liar to say I am not one of them but we'll just keep
trying to win games as they come along and see where that takes us.'